MetLife, the largest U.S. insurer, will make a final plea on Monday to a group of U.S. regulators determined to subject it to tougher oversight as they probe which firms could pose a risk to the larger financial system.

MetLife will meet behind closed doors the heads of the agencies grouped together in the Financial Stability Oversight Council (FSOC), who want the Federal Reserve to oversee MetLife's business and force it to meet higher capital standards.